I just bought a 06 6.0 and after having it 4 days it started to sputter around 55-60 mph. Then it would slow start like the batteries were going dead.
First chance I got I took it in and got an oil change, & fuel filters changed.
While it was in I had them check the voltage on my batteries. Turns out I had a bad alternator. New fuel filters did not help the sputtering.
Sputtering only happens when accelerating at normal speeds. When I "get on it"
it doesn't sputter. No smoke, just a sputter. Could the low voltage from the bad alternator have damaged my FICM?

I just bought a 06 6.0 and after having it 4 days it started to sputter around 55-60 mph. Then it would slow start like the batteries were going dead.
First chance I got I took it in and got an oil change, & fuel filters changed.
While it was in I had them check the voltage on my batteries. Turns out I had a bad alternator. New fuel filters did not help the sputtering.
Sputtering only happens when accelerating at normal speeds. When I "get on it"
it doesn't sputter. No smoke, just a sputter. Could the low voltage from the bad alternator have damaged my FICM?

Yes it could have you need to check it. use the below procedure or get an Edge Insight CS\CTS and monitor it that way

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